staging: octeon: Use 'u64' instead of 'uint64_t' in union cvmx_pip_wqe_word2

staging: octeon: Use 'u64' instead of 'uint64_t' in union cvmx_pip_wqe_word2

In the kernel type 'u64' is preferred over type 'uint64_t'. So, refactor
the 'union cvmx_pip_wqe_word2' to use the former. At the same time, take
advantage of this to align the bits quantity to improve readability.
Also, separate the structs with blank lines to gain readability.

Signed-off-by: Len Bao <len.bao@gmx.us>
Link: https://lore.kernel.org/r/20250727101052.41181-1-len.bao@gmx.us
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>